Time to move the 2012 earthnight out of "Texture Tools" I am not using the TX tools so.....

using the 2006 Cal. ( f16) as a burn mask
and after adding the 2000 "gas flares" and "fire"

and setting NY NY to about 160 ( 140 to 190 over downtown)
--- the 2006 cal had NYNY at a 76 px value ---

i get this

and Celestia screen shots

I have a bit of a habit of just scrapping things and starting over
-- and this is a start over

removed the "earth map" from the background of the 2012 EO EarthNight from each of the RED,GREEN,BLUE layers
( the EO 2012 is normalized so
so subtract the value of the ice RED 15, GREEN 31, BLUE 82 and renormalize each layer

This moved the image into the 32 bit FLOAT
so doing a convert to UCHAR put the ( now negative earth map to ZERO)

burned each layer using a slightly blurred 2006 Cal.

Multiply one image by the other and divide by the max px value on the mask , this also moved the image back into FLOAT
Then adjusted exposure and gama to "0.4" ( for looks )

then back to 0 to 255 normalized UCHAR as the orig. image was .

Combined the three red,green,blue layers into a single image

the location of the MAX px value is still the same in this rework of the 2012 as was in the 2006 cal.

there are some artifacts that need removing
lights not in the 2006 cal map are a bit BRIGHT

Time to move the 2012 earthnight out of "Texture Tools" I am not using the TX tools so.....

Quote:

using the 2006 Cal. ( f16) as a burn mask and after adding the 2000 "gas flares" and "fire"

and setting NY NY to about 160 ( 140 to 190 over downtown)--- the 2006 cal had NYNY at a 76 px value ---

i get this

and Celestia screen shots

I have a bit of a habit of just scrapping things and starting over -- and this is a start over

removed the "earth map" from the background of the 2012 EO EarthNight from each of the RED,GREEN,BLUE layers ( the EO 2012 is normalized so so subtract the value of the ice RED 15, GREEN 31, BLUE 82 and renormalize each layer

burned each layer using a slightly blurred 2006 Cal.( adjusted exposure and gama for looks )Multiply one image by the other and divide by the max px value on the mask

moved the gama to 0.4 ( looks )

the location of the MAX px value is still the same in this rework of the 2012 as was in the 2006 cal.

there are some artifacts that need removing lights not in the 2006 cal map are a bit BRIGHT

I had a look at my 32k VT Earthnight map that I made myself a number of years ago.
I used as raw input the 32k radiance calibrated BW nightlights map and colored it with GIMP, using a truecolor reference photo taken by astronauts.

During the GIMP coloration process I requested the luminosity to remain CONSTANT. This procedure avoids any color-wallpaper-type enhancements for which NASA imaging wizzards are so well known

Here is how the NY region looks like in my case:

I noted this dark bluish background in your EarthNight images which I have avoided throughout. Here is a full-Earth shot:

Anyway, you new maps look beautiful. For curiosity, I would still like to see the new EarthNight images with NYNY reduced to 76 px (instead of your present 160).

there are two types of noise
a "salt & pepper" ( easy to remove )
-- from memory
the city lights are from about 1 to 6000 px value
the s&p is from about -2000 to 16000 px value
then do to the sensitivity the moon light and normal sky glow lit up the ground

that needed to be removed with a "highpass" of the Earth texture ( red band )
subtracting it from the earthlights map

it is not 100% in north/ northwest Canada , that lighting looks to be aurora

the S&P noise is easy to remove with gmic ,in sections ( CImg.h has a 4 gig max , 32 bit coding )
the "-remove_hotpixels" is very much like the highpass/lowpass
BUT the isis tool uses a square boxcar that had to be large enough ( 13x13) that was leaving NASTY artifacts
this is using a heat flow pde to remove the salt and pepper

What I mean is that each streat light or other light shines. This means that it produces an area of decreasing light intensity around the proper light source. If one looks from an airplane (or satelite) onto a city, this coherent shine is very conspicuous, since there are many streetlights.
Too much noise filtering can easily also filter away this crucial diffuse shine.

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